Does anyone know the dimensions of a powermac G4 power supply? I am planning of buying a powermac case and modding it to a pc. now my other question is what is a good pc powersupply that would fit in a PMac G4 any model.

It sounds like he is sticking a PC motherboard into an Apple case. If that is the situation then just match the PSU to the PC mobo. Grab a 450-550w Seasonic or Corsair. You might have to slightly trim the rear plastic of the case I think.. but it should fit inside the case decently.

There are a number of pages around that bring up what you want to do, just look.

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